For circular joints and for the polyolefins ultrasonics fight — 100 to 4000 rpm, 2500 N, parts to ø300 mm, stopping within ±0.1°.
Spin welding rotates one part against a fixed one under pressure. The friction melts the interface; rotation stops; the melt solidifies under load. Where the joint is circular it produces a stronger, more reliably hermetic weld than ultrasonics, on materials ultrasonics struggle with — polypropylene and polyethylene in particular.
| Motor power | 1 kW · 2.5 kW · 4 kW · 5 kW |
| Spindle speed | 100 to 4000 rpm (servo drive to 2500 rpm) |
| Maximum force | 2500 N pneumatic |
| Maximum part diameter | ø300 mm |
| Vertical stroke | 100 mm |
| Spin time | 0.01 to 9.99 seconds, adjustable |
| Control | PLC with HMI panel · revolution mode or time mode |
| Angular accuracy | ±0.1° — parts stop in a defined orientation |
| Weight | 120 kg |
Spin welding lives or dies on the fixture. The part has to be held square, concentric and without flex, because everything the weld depends on — the pressure, the interface speed, where the part stops — is measured from that fixture, not from the part.
That is why a spin welder is quoted as a machine plus tooling rather than as a machine. Send us the part and the joint, and the fixture is designed around them.
The spindle stops the part within ±0.1°, so a spout, a thread or a printed panel finishes where the drawing says it should rather than wherever the rotation ran out.
Send us the part →Fuel, oil, air and water filters — the classic spin weld application.
Expansion tanks, washer bottles, coolant reservoirs.
Where the seal has to hold pressure or vacuum.
Sealed assemblies containing a mechanism that ultrasonics would disturb.
Where a genuinely gas-tight plastic joint is required.
Polypropylene fittings and bodies that ultrasonics handle poorly.
Ultrasonic welding is decided by the parts — the resin, the wall, the joint and what the weld has to do. Send photos and drawings through the enquiry form and you get an engineered answer.